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While Yammer (launched at TechCrunch Disrupt, BTW) might have pioneered what was, at the time, dubbed “Twitter for work”, it wasn’t until Slack came along that people started to realise just how powerful this method of communication could be.

From open source integration to new kinds of collaborative tools built by developers on its platform, Slack has become the gateway drug to online collaboration used by small and large companies alike.

Cal Henderson was formerly the head of engineering for Flickr, in San Francisco, California. In April, 2009, he was reported to be starting a new stealth social gaming company with Flickr founder Stewart Butterfield. The rest, as they say, is history.

Before Flickr, he was the technical director of Special Web Projects at Emap, a UK media company. In his spare time, he writes software, develops web publishing tools, and writes occasional articles about web application development and security.

Disrupt Berlin 2017 takes place December 4-5 at the historic Arena Berlin in the heart of Berlin, Germany.

At Disrupt you’ll see the Startup Battlefield competition, in which a handful of startups pitch our judges with the hopes of winning the coveted Disrupt Cup and a massive cash prize. And you’ll get to chat with representatives from scores of promising startups in Startup Alley, see amazing on stage content, and unwind after a long day at the show with a cocktail and some new friends at the Disrupt after party.

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Crunchbase

OverviewSlack Technologies is an enterprise software platform that allows teams and businesses of all sizes to communicate effectively. Slack works seamlessly with other software tools within a single integrated environment, providing an accessible archive of an organization’s communications, information and projects. Based in San Francisco, Slack also has offices in London, Dublin, Melbourne, New York, …